$path = "master:/sitecore/content"
$x = Get-ChildItem $path
Write-Host $x.Name

Get-ChildItem : Method not found: 'Void System.Management.Automation.Provider.ContainerCmdletProvider.GetChildItems(System.String, Boolean, UInt32)'.
At line:2 char:6
+ $x = Get-ChildItem $path
+      ~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [Get-ChildItem], MissingMethodException
    + FullyQualifiedErrorId : System.MissingMethodException,Microsoft.PowerShell.Commands.GetChildItemCommand